System of equations i need to find x and y corridents

Question

Solve using elimination.

^–10x − y = 3

x + 3y = 20

Answer 1

-10x - y = 3

x + 3y = 20

First, multiply the first equation by 3, then add the equations together.

3(-10x - y = 3) → -30x - 3y = 9

Becomes:

-30x - 3y = 9

x + 3y = 20

Add to eliminate y:

-29x =29

Then, solve for x:

-29x/-29 = 29/-29

x = -1

Now, plug this x value back in to solve for y! You can use either of the original equations:

x + 3y = 20

-1 + 3y = 20

3y = 21

y = 7